Inline trivial implementation of rustc_target::abi::Align
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@ -441,16 +441,28 @@ pub struct Align {
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}
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impl Align {
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#[inline]
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pub fn from_bits(bits: u64) -> Result<Align, String> {
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Align::from_bytes(Size::from_bits(bits).bytes())
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}
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#[inline]
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pub fn from_bytes(align: u64) -> Result<Align, String> {
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// Treat an alignment of 0 bytes like 1-byte alignment.
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if align == 0 {
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return Ok(Align { pow2: 0 });
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}
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#[cold]
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fn not_power_of_2(align: u64) -> String {
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format!("`{}` is not a power of 2", align)
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}
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#[cold]
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fn too_large(align: u64) -> String {
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format!("`{}` is too large", align)
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}
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let mut bytes = align;
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let mut pow2: u8 = 0;
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while (bytes & 1) == 0 {
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@ -458,19 +470,21 @@ impl Align {
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bytes >>= 1;
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}
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if bytes != 1 {
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return Err(format!("`{}` is not a power of 2", align));
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return Err(not_power_of_2(align));
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}
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if pow2 > 29 {
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return Err(format!("`{}` is too large", align));
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return Err(too_large(align));
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}
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Ok(Align { pow2 })
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}
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#[inline]
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pub fn bytes(self) -> u64 {
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1 << self.pow2
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}
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#[inline]
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pub fn bits(self) -> u64 {
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self.bytes() * 8
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}
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@ -479,12 +493,14 @@ impl Align {
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/// (the largest power of two that the offset is a multiple of).
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///
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/// N.B., for an offset of `0`, this happens to return `2^64`.
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#[inline]
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pub fn max_for_offset(offset: Size) -> Align {
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Align { pow2: offset.bytes().trailing_zeros() as u8 }
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}
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/// Lower the alignment, if necessary, such that the given offset
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/// is aligned to it (the offset is a multiple of the alignment).
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#[inline]
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pub fn restrict_for_offset(self, offset: Size) -> Align {
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self.min(Align::max_for_offset(offset))
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}
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